Bors Radu, Yun Jeongsik, Marzak Philipp, Fichtner Johannes, Scieszka Daniel, Bandarenka Aliaksandr S
Department of Physics, ECS, Technical University of Munich, James-Franck-Straße 1, 85748 Garching, Germany.
Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 Munich, Germany.
ACS Omega. 2018 May 10;3(5):5111-5115. doi: 10.1021/acsomega.8b00273. eCollection 2018 May 31.
Identification and characterization of novel battery electrode materials are key factors in transitioning the grids to renewable energy provision. Given the scale of the challenge, special attention should be paid to safety and availability of resources. This paper presents a new electrode material for aqueous batteries and supercapacitors based on highly available resources: chromium(II) hexacyanoferrate (CrHCF) thin films. Electrodeposited CrHCF exhibited "half-charge" potentials ( ) of ∼0.69 and ∼0.72 V versus silver/silver chloride (reference electrode) for Na and K intercalation, respectively, a high specific capacity of ∼88 mA h/g (10 C), and a good rate performance at fast C-rate (360 C). The electrolyte composition significantly influences the long-term cycling stability of the CrHCF electrodes and the choice of the intercalating alkali metal cations significantly impacts the potentials. Finally, a CrHCF-based symmetric cell (quasi-supercapacitor) was constructed and showed high specific energy of ∼4.6 W h/kg at 100 C.
新型电池电极材料的识别与表征是电网向可再生能源供电转型的关键因素。鉴于挑战的规模，应特别关注资源的安全性和可用性。本文基于高可用性资源，提出了一种用于水系电池和超级电容器的新型电极材料：亚铁氰化铬（II）（CrHCF）薄膜。电沉积的CrHCF对Na和K的嵌入分别表现出相对于银/氯化银（参比电极）约0.69 V和约0.72 V的“半充电”电位，具有约88 mA h/g（10 C）的高比容量，并且在快速C倍率（360 C）下具有良好的倍率性能。电解质组成显著影响CrHCF电极的长期循环稳定性，而嵌入碱金属阳离子的选择对电位有显著影响。最后，构建了基于CrHCF的对称电池（准超级电容器），并在100 C下显示出约4.6 W h/kg的高比能量。
